Extend PKG_CONFIG path rather than overwriting it

__tests__/find-pypy.test.ts

@@ -307,6 +307,32 @@ describe('findPyPyVersion', () => {
     ).rejects.toThrow();
   });
 
+  it('update PKG_CONFIG_PATH', async () => {
+    process.env['PKG_CONFIG_PATH'] = '/test/dir';
+    spyCacheDir = jest.spyOn(tc, 'cacheDir');
+    spyCacheDir.mockImplementation(() =>
+      path.join(toolDir, 'PyPy', '3.7.7', architecture)
+    );
+    spyChmodSync = jest.spyOn(fs, 'chmodSync');
+    spyChmodSync.mockImplementation(() => undefined);
+    await expect(
+      finder.findPyPyVersion(
+        'pypy-3.7-v7.3.x',
+        architecture,
+        true,
+        false,
+        false
+      )
+    ).resolves.toEqual({
+      resolvedPythonVersion: '3.7.9',
+      resolvedPyPyVersion: '7.3.3'
+    });
+    expect(spyCoreExportVariable).toHaveBeenCalledWith(
+      'PKG_CONFIG_PATH',
+      expect.stringContaining('/test/dir')
+    );
+  });
+
   it('found and install successfully', async () => {
     spyCacheDir = jest.spyOn(tc, 'cacheDir');
     spyCacheDir.mockImplementation(() =>

src/find-graalpy.ts

@@ -6,6 +6,8 @@ import * as semver from 'semver';
 import * as core from '@actions/core';
 import * as tc from '@actions/tool-cache';
 
+import {addPkgConfigPathToEnv} from './utils';
+
 export async function findGraalPyVersion(
   versionSpec: string,
   architecture: string,
@@ -67,7 +69,7 @@ export async function findGraalPyVersion(
     core.exportVariable('Python2_ROOT_DIR', installDir);
     // https://cmake.org/cmake/help/latest/module/FindPython3.html#module:FindPython3
     core.exportVariable('Python3_ROOT_DIR', installDir);
-    core.exportVariable('PKG_CONFIG_PATH', pythonLocation + '/lib/pkgconfig');
+    addPkgConfigPathToEnv(pythonLocation + '/lib/pkgconfig');
     core.addPath(pythonLocation);
     core.addPath(_binDir);
   }

src/find-pypy.ts

@@ -8,7 +8,8 @@ import {
   readExactPyPyVersionFile,
   validatePythonVersionFormatForPyPy,
   IPyPyManifestRelease,
-  getBinaryDirectory
+  getBinaryDirectory,
+  addPkgConfigPathToEnv
 } from './utils';
 
 import * as semver from 'semver';
@@ -92,7 +93,8 @@ export async function findPyPyVersion(
     core.exportVariable('Python2_ROOT_DIR', installDir);
     // https://cmake.org/cmake/help/latest/module/FindPython3.html#module:FindPython3
     core.exportVariable('Python3_ROOT_DIR', installDir);
-    core.exportVariable('PKG_CONFIG_PATH', pythonLocation + '/lib/pkgconfig');
+    addPkgConfigPathToEnv(pythonLocation + '/lib/pkgconfig');
+
     core.addPath(pythonLocation);
     core.addPath(_binDir);
   }

src/find-python.ts

@@ -10,6 +10,8 @@ import * as core from '@actions/core';
 import * as tc from '@actions/tool-cache';
 import * as exec from '@actions/exec';
 
+import {addPkgConfigPathToEnv} from './utils';
+
 // Python has "scripts" or "bin" directories where command-line tools that come with packages are installed.
 // This is where pip is, along with anything that pip installs.
 // There is a separate directory for `pip install --user`.
@@ -150,7 +152,6 @@ export async function useCpythonVersion(
   );
   if (updateEnvironment) {
     core.exportVariable('pythonLocation', installDir);
-    core.exportVariable('PKG_CONFIG_PATH', installDir + '/lib/pkgconfig');
     core.exportVariable('pythonLocation', installDir);
     // https://cmake.org/cmake/help/latest/module/FindPython.html#module:FindPython
     core.exportVariable('Python_ROOT_DIR', installDir);
@@ -158,7 +159,8 @@ export async function useCpythonVersion(
     core.exportVariable('Python2_ROOT_DIR', installDir);
     // https://cmake.org/cmake/help/latest/module/FindPython3.html#module:FindPython3
     core.exportVariable('Python3_ROOT_DIR', installDir);
-    core.exportVariable('PKG_CONFIG_PATH', installDir + '/lib/pkgconfig');
+
+    addPkgConfigPathToEnv(installDir + '/lib/pkgconfig');
 
     if (IS_LINUX) {
       const libPath = process.env.LD_LIBRARY_PATH

src/utils.ts

@@ -422,3 +422,17 @@ export function getDownloadFileName(downloadUrl: string): string | undefined {
     ? path.join(tempDir, path.basename(downloadUrl))
     : undefined;
 }
+
+export function addPkgConfigPathToEnv(path: string): undefined {
+  const pkg_config_path = process.env['PKG_CONFIG_PATH'];
+
+  if (pkg_config_path === undefined) {
+    core.exportVariable('PKG_CONFIG_PATH', path);
+  } else {
+    if (IS_WINDOWS) {
+      core.exportVariable('PKG_CONFIG_PATH', `${path};${pkg_config_path}`);
+    } else {
+      core.exportVariable('PKG_CONFIG_PATH', `${path}:${pkg_config_path}`);
+    }
+  }
+}